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"""Cache for commonly shared data that is intended to be immutable."""
from __future__ import annotations
import collections.abc as c
import typing as t
from .config import (
CommonConfig,
)
TValue = t.TypeVar('TValue')
class CommonCache:
"""Common cache."""
def __init__(self, args: CommonConfig) -> None:
self.args = args
def get(self, key: str, factory: c.Callable[[], TValue]) -> TValue:
"""Return the value from the cache identified by the given key, using the specified factory method if it is not found."""
if key not in self.args.cache:
self.args.cache[key] = factory()
return self.args.cache[key]
def get_with_args(self, key: str, factory: c.Callable[[CommonConfig], TValue]) -> TValue:
"""Return the value from the cache identified by the given key, using the specified factory method (which accepts args) if it is not found."""
if key not in self.args.cache:
self.args.cache[key] = factory(self.args)
return self.args.cache[key]
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